desc.Query(qq => qq.Bool(qqq => qqq.Must(m => m.Range(r => r.OnField("lastModified").GreaterOrEquals("from").LowerOrEquals("to")), s => s.Prefix(p => p.OnField("test").Value("query")))));

List<QueryContainer> queryList = new List<QueryContainer>();

    // Range
    if (searchTypes.Contains(5)) {
        QueryDescriptor<BackupEntitySearchDocument> qd = new QueryDescriptor<BackupEntitySearchDocument>();
        qd.Range(r => r.OnField("lastModified").GreaterOrEquals("from").LowerOrEquals("to"));
        queryList.Add(qd);

    }

    /// A couple other query types may be added to queryList here

    desc.Query(qq => qq.Bool(b => b.Must(queryList)));